EP2455743B1 - Selbstdiagnose eines Partikelsensors - Google Patents

Selbstdiagnose eines Partikelsensors Download PDF

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Publication number
EP2455743B1
EP2455743B1 EP11188612.3A EP11188612A EP2455743B1 EP 2455743 B1 EP2455743 B1 EP 2455743B1 EP 11188612 A EP11188612 A EP 11188612A EP 2455743 B1 EP2455743 B1 EP 2455743B1
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EP
European Patent Office
Prior art keywords
particulate matter
bias resistor
electrode
substrate
matter sensor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP11188612.3A
Other languages
English (en)
French (fr)
Other versions
EP2455743A2 (de
EP2455743A3 (de
Inventor
Charles Scott Nelson
Lary Robert Hocken
Michael Conklin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Delphi Technologies IP Ltd
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Delphi Technologies IP Ltd
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Filing date
Publication date
Application filed by Delphi Technologies IP Ltd filed Critical Delphi Technologies IP Ltd
Publication of EP2455743A2 publication Critical patent/EP2455743A2/de
Publication of EP2455743A3 publication Critical patent/EP2455743A3/de
Application granted granted Critical
Publication of EP2455743B1 publication Critical patent/EP2455743B1/de
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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N35/00—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor
    • G01N35/00584—Control arrangements for automatic analysers
    • G01N35/00594—Quality control, including calibration or testing of components of the analyser
    • G01N35/00712—Automatic status testing, e.g. at start-up or periodic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/1466—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being a soot concentration or content
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/06—Investigating concentration of particle suspensions
    • G01N15/0656—Investigating concentration of particle suspensions using electric, e.g. electrostatic methods or magnetic methods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D41/222—Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices

Definitions

  • the inventors herein have recognized a need for an improved sensing system having a particulate matter sensor that reduces and/or eliminates the foregoing deficiencies.
  • a method for diagnosing a soot sensing system includes sensing an electrical property of a particulate matter sensor, comparing the electrical property to predetermined threshold values, and determining if a fault condition exists based on the results of the comparison.
  • Fig. 1 is an electrical schematic of a prior art particulate matter sensing system 10.
  • the system may be generally considered as partitioned as indicated into a controller portion 20, a wiring harness portion 30, and a sensing element portion 40.
  • the controller portion 20 comprises a means for measuring the impedance of a circuit connected thereto.
  • the impedance measurement means includes a voltage source 22 that provides a voltage value Vsupply, a pull-up resistor 24 having a resistance value Rpullup, and a voltage measurement means 26. While voltage source 22 is depicted in Fig.
  • Fig. 3 is an electrical schematic diagram of an alternate embodiment that provides certain advantages over the embodiment in Fig. 2 .
  • controller portion 20 and wiring harness portion 30 are substantially as described in relation to Figs. 1 and 2 .
  • Sensing element portion 240 includes a first conductor 246 electrically connected to first electrode 242 and a second conductor 248 electrically connected to second electrode 244.
  • Sensing element portion 240 also includes a bias resistor 250 located such that first electrode 242 is electrically connected between connection means 37 and a first end of bias resistor 250, and second electrode 244 is electrically connected between electrical connection means 39 and a second end of bias resistor 250.
  • particulate matter sensing system 200 including sensing element portion 240 can be understood using the same description and equations used to describe the operation of particulate matter sensing system 100 in Fig. 2 as previously described.
  • Relocating the bias resistor 250 so that the first and second electrodes 242 and 244 are electrically between the connection means 37, 39 and the bias resistor 250 allows improved diagnostic capability.
  • the system 100 depicted in Fig. 2 does not permit detection of damage to any part of the sensing element 140 to the right of the junctions of bias resistor 150 with conductors 146 and 148.
  • the location of bias resistor 250 in Fig. 3 permits recognition of an open circuit fault anywhere on the sensing element 240, in addition to allowing detection of fault conditions associated with connection means 27, 28, 37, or 38, as well as open circuit faults in wires 32, 34.
  • Fig. 4 is an exploded perspective view of a sensing element 140 according to an aspect of the invention.
  • the sensing element 140 includes an electrically insulating substrate 154. While shown as a single layer, it will be appreciated that substrate 154 may be formed by laminating together a plurality of layers. Conductive material disposed on one surface of substrate 154 is patterned to form conductors 146 and 148 and electrodes 142 and 144. Resistor material to form bias resistor 150 is deposited so as to connect to conductors 146 and 148.
  • a protective layer 164 may also be included to protect the conductive material that forms electrodes 142 and 144, as well as portions of the conductors 146, 148 that may be exposed to abrasive particles in the gas stream being measured.
  • the protective layer 164 includes an open area 166 exposing the gap between the electrodes 142 and 144 to allow particulate matter to bridge the electrodes 142 and 144.
  • the protective layer 164 may also extend to cover bias resistor 150.
  • Fig. 5 is a plan view of the conductor and resistor pattern of a sensing element 140 as depicted in Figs. 2 and 4 .
  • Bias resistor 150 is located remote from the first electrode 142 and the second electrode 144 to minimize heating of the bias resistor 150 when the heater (not shown) is activated to clean the particulate matter from the vicinity of the electrodes 142, 144, as well as to facilitate locating the bias resistor 150 on the side of the sealing means that will protect the bias resistor 150 from the gas stream.
  • Fig. 6 is a plan view of the conductor and resistor pattern of a sensing element 240 as described and depicted by Fig. 3 .
  • the bias resistor 250 is connected such that the first electrode 242 is electrically in series between bias resistor 250 and conductor 246, and the second electrode 244 is electrically in series between bias resistor 250 and conductor 248.
  • the pattern shown in Fig. 6 allows detection of an open circuit fault anywhere in the particulate sensing system 200, including an open circuit condition in the conductive material that forms electrodes 242 and 244 on sensing element 240. Additionally, the pattern shown in Fig.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Pathology (AREA)
  • Immunology (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Biochemistry (AREA)
  • Mechanical Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Dispersion Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Geophysics And Detection Of Objects (AREA)

Claims (7)

  1. Partikelsensor zum Erfassen von Partikeln in einem Gasstrom, der aufweist:
    ein elektrisch nicht-leitendes Substrat;
    eine erste Elektrode, die auf einer ersten Oberfläche des Substrats angeordnet ist;
    eine zweite Elektrode, die auf der ersten Oberfläche des Substrats angeordnet ist und von der ersten Elektrode beabstandet ist;
    einen Vorspannungswiderstand, der auf dem Substrat angeordnet ist, der elektrisch zwischen der ersten Elektrode und der zweiten Elektrode verbunden ist; und
    ein Dichtungsmittel, das konfiguriert ist zum Abdichten eines Teils des Substrats gegen den Gasstrom,
    wobei der Vorspannungswiderstand auf dem Teil des Substrats angeordnet ist, der gegen den Gasstrom abgedichtet ist,
    dadurch gekennzeichnet, dass
    der Partikelsensor zusätzlich aufweist eine Impedanzmesseinrichtung, die konfiguriert ist zum Messen der Impedanz zwischen den zwei Elektroden des Erfassungselements;
    eine Heizeinrichtung, die angeordnet und konfiguriert ist zum Erwärmen eines ersten Teils des Substrats, wobei der Vorspannungswiderstand auf einem zweiten Teil des Substrats entfernt von der Heizeinrichtung angeordnet ist, wobei der Vorspannungswiderstand einen Widerstandswert größer als ungefähr 100 Kilohm hat.
  2. Der Partikelsensor gemäß Anspruch 1, wobei der Vorspannungswiderstand einen Widerstandswert größer als ungefähr 1 Megaohm hat.
  3. Der Partikelsensor gemäß Anspruch 2, wobei der Vorspannungswiderstand einen Widerstandswert von ungefähr 7 Megaohm bis 10 Megaohm hat.
  4. Der Partikelsensor gemäß Anspruch 3, wobei der Vorspannungswiderstand einen Widerstandswert größer als ungefähr 10 Megaohm hat.
  5. Der Partikelsensor gemäß Anspruch 1, der zusätzlich eine erste Verbindungseinrichtung, die elektrisch mit der ersten Elektrode verbunden ist, und eine zweite Verbindungseinrichtung aufweist, die elektrisch mit der zweiten Elektrode verbunden ist, wobei die erste und die zweite Verbindungseinrichtung ausgebildet sind zur Verbindung mit der Impedanzmesseinrichtung extern zu dem Partikelsensor, wobei die erste Elektrode elektrisch in Serie zwischen der ersten Verbindungseinrichtung und dem Vorspannungswiderstand angeordnet ist.
  6. Der Partikelsensor gemäß Anspruch 1, wobei der Vorspannungswiderstand einen Film aus Widerstandsmaterial aufweist, das auf dem Substrat ausgebildet ist und konfiguriert ist, getrimmt zu werden, um seinen Widerstandswert auf einen vorgegebenen Sollwiderstandswert zu erhöhen.
  7. Verfahren zur Diagnose eines Partikelsensors gemäß einem der vorhergehenden Ansprüche; wobei das Verfahren die Schritte aufweist:
    Bestimmen der Impedanz der Kombination aus elektrischer Verbindungseinrichtung und Erfassungselement, und
    Anzeigen eines Fehlerzustands, wenn die Impedanz der Kombination aus elektrischer Verbindungseinrichtung und Erfassungselement größer als der Widerstandswert des Vorspannungswiderstands ist.
EP11188612.3A 2010-11-17 2011-11-10 Selbstdiagnose eines Partikelsensors Active EP2455743B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US12/947,867 US8928338B2 (en) 2010-11-17 2010-11-17 Self diagnostics of a particulate matter sensor

Publications (3)

Publication Number Publication Date
EP2455743A2 EP2455743A2 (de) 2012-05-23
EP2455743A3 EP2455743A3 (de) 2017-12-20
EP2455743B1 true EP2455743B1 (de) 2020-01-08

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EP11188612.3A Active EP2455743B1 (de) 2010-11-17 2011-11-10 Selbstdiagnose eines Partikelsensors

Country Status (3)

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US (1) US8928338B2 (de)
EP (1) EP2455743B1 (de)
JP (1) JP2012108127A (de)

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Also Published As

Publication number Publication date
EP2455743A2 (de) 2012-05-23
EP2455743A3 (de) 2017-12-20
JP2012108127A (ja) 2012-06-07
US20120119759A1 (en) 2012-05-17
US8928338B2 (en) 2015-01-06

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